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It is nominally a circle with a variable radius of approximately 12 miles (19 km) centered in the town of New Castle, Delaware. [3] In 1750, the center of the circle was fixed at the cupola of the courthouse in New Castle. The Twelve-Mile Circle continues into the Delaware River.
The New Castle Court House Museum is the center of a circle with a 12-mile radius that defines most of the border between the states of Delaware and Pennsylvania and parts of the borders between Delaware and New Jersey and Maryland. [3] It is one of the oldest courthouses in the United States and has played a role in a number of historic events.
A 12-mile (radius) circle (12 mi (19 km)) around the city of New Castle, Delaware. A "tangent line" connecting the midpoint of the transpeninsular line to the western side of the 12-mile circle. A "north line" along the meridian (line of longitude) from the tangent point to the Maryland-Pennsylvania border.
North of the city, after meeting SR 31, SR 4 leaves the expressway bypass. At the next exit, US 36 also leaves the expressway. On its way to Delaware, US 36 meets New Dover, Ostrader, and SR 257. Between the Ohio Wesleyan University and the Olentangy River in Delaware, US 36 meets US 23/US 42, beginning a short concurrency with US 42.
The Transpeninsular Line (at approximately 38°27′ N) is a surveyed line, the eastern half of which forms the north–south border between Delaware and Maryland. The border turns roughly north from the midpoint of the line towards the Twelve-Mile Circle, which forms much of the remainder of the Delaware land border.
The three highways run together until another signalized intersection where SR 521 breaks off towards the northeast. This 1.76-mile (2.83 km) stretch of SR 521 is not explicitly signed in the field. [2] [3] [4] The aforementioned signalized intersection with US 36/SR 37 on the east side of Delaware marks the start of the signed portion of SR 521.
Delaware County is a county located in the central portion of the U.S. state of Ohio.As of the 2020 census, the population was 214,124. [3] Its county seat and largest city is Delaware. [4]
The Delaware Boundary Markers historic district is located along the state boundary lines between Delaware and Maryland, and between Delaware and Pennsylvania.The district includes 94 contributing sites along the Mason–Dixon line and includes the Transpeninsular Line, Post Marked West site, Tangent Line, the Arc Corner, and the Twelve-Mile Circle.